package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现自动填充
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 拦截的切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行数据填充...");
        //获取参数
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        Object arg = args[0];
        //获取当前被拦截的方法的数据库操作类型
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType value = annotation.value();
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据对应的数据库操作类型，为对应的属性赋值
        if (value == OperationType.INSERT){
            //通过arg参数获取方法名，为变量赋值
            //通过反射获取arg参数的对象名
            try {
                Method setUpdateTime = arg.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setCreateTime = arg.getClass().getDeclaredMethod("setCreateTime", LocalDateTime.class);
                Method setCreateUser = arg.getClass().getDeclaredMethod("setCreateUser", Long.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod("setUpdateUser", Long.class);
                setUpdateTime.invoke(arg, now);
                setCreateTime.invoke(arg, now);
                setCreateUser.invoke(arg, currentId);
                setUpdateUser.invoke(arg, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        } else if (value == OperationType.UPDATE) {
            try {
                Method setUpdateTime = arg.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod("setUpdateUser", Long.class);
                setUpdateTime.invoke(arg, now);
                setUpdateUser.invoke(arg, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }


    }
}
